I'm experiencing with the Hub showing that there aren't any updates when there are. This specifically seems to happen when there is a Beaver Builder update.
So currently the Hub is showing no updates required. There are 2 sites where there is at least 1 update required and I've already updated another 2 plug ins manually after the Hub showed none were required.
Update on this. Chat support have just told me that it only shows wordpress.org and WPMU updates. Not according to your own website https://premium.wpmudev.org/blog/hub-activate-manage-delete-any-wordpress-plugin-or-theme/